Dies.



. PATENTED APR. 2, 190?.

P, EIESEGK; DIES APPLICATION FILED OUT-19. 1905';

I FIG. .1

UNITED STATES PATENT OFFICE.

DIES.

lb (Ll/Z whom it imty concern:

Be it known that I, PETER RIEsEGK, a resident of Allegheny city, in thecounty of Allegheny and State of Pennsylvania, have invented a new anduseful Improvement in Dies; and I do hereby declare the following to bea full, clear, and exact description thereof.

My invention relates to dies for the manufacture of metalliccellar-doors, sidewalks, &c. The object of my invention is to providecellar-doors or similar articles formed of metal pressed or stamped withpyramidal projections, the apexes of which are slightly rounded, so asto relieve the pressure on the foot of the pedestrian and the wear onthe shoes.

To these ends my invention comprises the novel features hereinafter setforth and claimed.

To enable others skilled in the art to make and use my invention, I willdescribe the same more fully, referring to the accompany.

ing drawings, in which Figure 1 is a front elevation, partly in section,of a suitable press with my improved dies secured therein. Fig. 2 is anenlarged sectional detail of a portion of the dies, showing the metalstamped thereby. Fig. 3 is a portion of a metal plate pressed by saiddies.

In the drawings the numeral 2 designates a suitable press upon thebed-block 3 of which is secured the lower or male die 4, havingthepyramidal projections 5. These projections 5 are preferably formedwith the sharp apexes 6 for the reason fully hereinafter set forth.Furthermore, these projec- "tions 5 are preferably staggered withreference to each other.

The upper or female die 7 is secured to the vertically-movable head 8,working in suitable guides in the press 2. This die 7 has the pyramidalrecesses 9 formed therein, coinciding with the correspondingly-shapedprojections 5 in the male die 4. The apexes 10,

however, of the recesses 9 are slightly rounded.

Specification of Letters Patent. Application filed October 19, 1905.Serial No. Z83A9'7.

Patented April 2, 1907.

I When my improved dies are in use, the

metal plate 11, from which the cellar-door or similar article is to beformed, is placed upon the lower die 4 and power applied to lower theupper die 7. As the upper or female die descends the projections 5 onthe male die 4 force the metal up into the recesses 9 of the die 7. Thisforms the pyramidal projections 12 on the metal plate 11. By having theapeXes of the recesses 9 slightly rounded the apeXes of the projections12 of the finished plate are also correspondingly rounded. It isdesirable, however, to preserve as nearly .as possible thepyramidal formof the projections 12, and in order to accomplish this the apexes 6 ofthe projections 5 of the die 4 are preferably sharp. By having theseapexes sharp it is possible to press the projections 12 on the platewith smaller round portions at the apeXes and so preserve the pyramidalform and yet give which will not present a sharp point .to the ball ofthe foot of the pedestrian, which is an noying to the person anddestructive to shoes.

By my improved dies I am able to finish a cellar-door with pyramidalprojections to prevent slipping, while at the same time not injurious tothe feet of the pedestrian. Heretofore round or bulbous projections havebeen used, which did not give the proper protection against slipping andwhich were also hard on the feet.

What I claim is- The combination of a male die having one or morepyramidal projections thereon with sharp apeXes, and a female die havingcoinciding recesses pyramidal in shape and having rounded apeXes.

n testimony whereof I, the said PETER RIEsEoK, have hereunto set myhand.

PETER RIESEOK.

a bearing-face at the top

